Effect of Phosphorous Calcined Gypsum on Shrinkage Characteristics of Calcium Sulfoaluminate Cement Clinker [磷建筑石膏对硫铝酸盐水泥熟料收缩特性的影响]

摘要

The setting time， chemical shrinkage， autogenous shrinkage， internal relative humidity and drying shrinkage of calcium sulfoaluminate （CSA） cement clinker blended with different amounts of phosphorous calcined gypsum （PCG） were investigated. The results show that the setting time of paste is shortened significantly with the increase of PCG content， and the rate of chemical shrinkage and the internal relative humidity of the paste is decreased gradually. The autogenous shrinkage has a good relationship with the internal relative humidity of the paste. The stable stage of chemical shrinkage is accelerated when the content of PCG is not more than 25%. When the content of PCG is 25% to 30%, the CSA cement paste expanded during the autogenous shrinkage test and the drying shrinkage of CSA cement clinker pastes are less than the control sample.

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